Resistors – Gibilisco MCQs in Electronics

This is the Multiple Choice Questions (MCQs) in Chapter 6: Resistors from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

Start Practice Exam Test Questions

1. Biasing in an amplifier circuit:

A. Keeps it from oscillating.

B. Matches it to other amplifier stages in a chain.

C. Can be done using voltage dividers.

D. Maximizes current flow.

2. A transistor can be protected from needless overheating by:

A. Current-limiting resistors.

B. Bleeder resistors.

C. Maximizing the driving power.

D. Shorting out the power supply when the circuit is off.

3. Bleeder resistors:

A. Are connected across the capacitor in a power supply.

B. Keep a transistor from drawing too much current.

C. Prevent an amplifier from being overdriven.

D. Optimize the efficiency of an amplifier.

4. Carbon-composition resistors:

A. Can handle lots of power.

B. Have capacitance or inductance along with resistance.

C. Are comparatively nonreactive.

D. Work better for ac than for dc.

5. The best place to use a wirewound resistor is:

A. In a radio-frequency amplifier.

B. When the resistor doesn’t dissipate much power.

C. In a high-power, radio-frequency circuit.

D. In a high-power, direct-current circuit.

6. A metal-film resistor:

A. Is made using solid carbon/phenolic paste.

B. Has less reactance than a wirewound type.

C. Can dissipate large amounts of power.

D. Has considerable inductance.

7. A meter-sensitivity control in a test instrument would probably be:

A. A set of switchable, fixed resistors.

B. A linear-taper potentiometer.

C. A logarithmic-taper potentiometer.

D. A wirewound resistor.

8. A volume control in a stereo compact-disc player would probably be:

A. A set of switchable, fixed resistors.

B. A linear-taper potentiometer.

C. A logarithmic-taper potentiometer.

D. A wirewound resistor.

9. If a sound triples in actual power level, approximately what is the decibel increase?

A. 3 dB.

B. 5 dB.

C. 6 dB.

D. 9 dB.

10. Suppose a sound changes in volume by _13 dB. If the original sound power is 1 W, what is the final sound power?

A. 13 W.

B. 77 mW.

C. 50 mW.

D. There is not enough information to tell.

11. The sound from a transistor radio is at a level of 50 dB. How many times the threshold of hearing is this, in terms of actual sound power?

A. 50.

B. 169.

C. 5,000.

D. 100,000.

12. An advantage of a rheostat over a potentiometer is that:

A. A rheostat can handle higher frequencies.

B. A rheostat is more precise.

C. A rheostat can handle more current.

D. A rheostat works better with dc.

13. A resistor is specified as having a value of 68 Ω, but is measured with an ohmmeter as 63 Ω. The value is off by:

A. 7.4 percent.

B. 7.9 percent.

C. 5 percent.

D. 10 percent.

14. Suppose a resistor is rated at 3.3 K Ω, plus or minus 5 percent. This means it can be expected to have a value between:

A. 2,970 and 3,630 Ω 

B. 3,295 and 3,305 Ω.

C. 3,135 and 3,465 Ω.

D. 2.8 KΩ and 3.8 KΩ.

15. A package of resistors is rated at 56 Ω, plus or minus 10 percent. You test them with an ohmmeter. Which of the following values indicates a reject?

A. 50.0 Ω.

B. 53.0 Ω.

C. 59.7 Ω.

D. 61.1 Ω.

16. A resistor has a value of 680 Ω, and you expect it will have to draw 1 mA maximum continuous current. What power rating is best for this application?

A. 1/4 W.

B. 1/2 W.

C. I W.

D. 2 W.

17. Suppose a 1-K Ω resistor will dissipate 1.05 W, and you have many 1-W resistors of all common values. If there’s room for 20-percent resistance error, the cheapest solution is to use:

A. Four 1 K Ω, 1-W resistors in series-parallel.

B. Two 2.2 K Ω 1-W resistors in parallel.

C. Three 3.3 K Ω, 1-W resistors in parallel.

D. One 1 K Ω, 1-W resistor, since manufacturers allow for a 10-percent margin of safety.

18. Red, red, red, gold indicates a resistance of:

A. 22 Ω.

B. 220 Ω.

C. 2.2 K Ω.

D. 22 K Ω.

19. The actual resistance of the above unit can be expected to vary by how much above or below the specified value?

A. 11 Ω.

B. 110 Ω.

C. 22 Ω.

D. 220 Ω.

20. A resistor has three bands: gray, red, yellow. This unit can be expected to have a value within approximately what range?